Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X Datenbogen
Produktcode
DK-TM4C129X
Register 2: 1-Wire Timing Override (ONEWIRETIM), offset 0x004
The 1-Wire Timing Override (ONEWIRETIM) register allows for overriding of the timing rules for
the 1-Wire interface. If a field is 0, the default is used (normal or overdrive).
the 1-Wire interface. If a field is 0, the default is used (normal or overdrive).
1-Wire Timing Override (ONEWIRETIM)
Base 0x400B.6000
Offset 0x004
Type RW, reset 0x0000.0000
Offset 0x004
Type RW, reset 0x0000.0000
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
W1SAM
W0REST
W0TIM
W1TIM
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Type
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
RSTTIM
ATRTIM
ATRSAM
W1SAM
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Type
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
Description
Reset
Type
Name
Bit/Field
Value 1 Timing
This field indicates the time low for a 1 in µs units.
0
RW
W1TIM
31:28
Value 0 Timing
Indicates time low for a 0 in 4 µs units.
Note:
If
W0TIM
has been programmed to a non-default value,
W0REST
must be programmed for correct functionality.
0
RW
W0TIM
27:23
Rest Time
This field indicates time to rest after a 0 in 1 µs units.
Note:
If
W0TIM
has been programmed to a non-default value,
W0REST
must be programmed for correct functionality.
0
RW
W0REST
22:19
Sample Time
Time to sample for a 1 vs 0 in µs after the release of the line by 1-Wire.
The
The
LSAM
bit is ignored if this bit is set.
0
RW
W1SAM
18:15
Answer-to-Reset Sample
Time to first sample for answer-to-reset in 8 µs units. Sampling continues
until time indicated by
until time indicated by
ATRTIM
bit.
Note:
When programming
ATRTIM
and
ATRSAM
, the value of
ATRTIM
must be greater than
ATRSAM
to prevent the line from
being flagged as STUCK.
0
RW
ATRSAM
14:11
Answer-to-Reset/Rest Period
This field indicates the answer-to-reset period in 16 µs units.
If the
SKATR
bit is set in the ONEWIRECS register, this value indicates
the rest period after reset.
Note:
When programming
ATRTIM
and
ATRSAM
, the value of
ATRTIM
must be greater than
ATRSAM
to prevent the line from
being flagged as STUCK.
0
RW
ATRTIM
10:6
Reset Low Time
Indicates the time reset is low in 32 µs units.
0
RW
RSTTIM
5:0
1521
December 13, 2013
Texas Instruments-Advance Information
Tiva
™
TM4C129XNCZAD Microcontroller